In the following figure, AD is the diameter of the circle with centre O. chords AB, BC and CD are equal. If ∠DEF = 110°, Calculate: ∠AEF
Exercise 17 (B) | Q 2.1 | Page 265
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Join AE, OB and OC
∵ AOD is the diameter,
∴ ∠AED = 90° (Angle in a semi-circle)
But ∠DEF = 110° (given)
∴ ∠AEF = ∠DEF - ∠AED
= 110° - 90° = 20°
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